Abstract
The 13C NMR spectra of the methyl esters of phaeophorbides- a and - b, mesophaeophorbides- a and - b, pyrophaeophorbide- a, mesopyrophaeophorbide- a, chlorin- e 6, mesochlorin- e 6, chlorin- p 6, rhodin- g 7, mesorhodin- g 7, phaeoporphyrin- a 5, 2-vinylphaeoporphyrin- a 5, rhodoporphyrin-XV, and 2-vinylrhodoporphyrin-XV, and of trans-octaethylchlorin, in deuteriochloroform and/or trifluoroacetic acid solution are reported. On the basis of comparisons within this comprehensive series and proton off-resonance decoupled spectra, assignments of most resonances are made; complete assignment of the quaternary “pyrrole” ring carbons was difficult to accomplish. A downfield shift of the α- and β- meso-carbons of chlorins in trifluoroacetic acid relative to deuteriochloroform is used to confirm that the Chlorobium chlorophylls (660) from Chloropseudomonas ethylicum are meso-methylated at the δ-position.
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